After commit 326bcaae41fc32303963e9b3067501afcab59d4d ("omap: Make a subset
of dmtimer functions into inline functions"),
arch/arm/plat-omap/include/plat/dmtimer.h is missing an include of linux/io.h
- add it.
Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Tony Lindgren <tony@atomide.com>